JP5495693B2 - Manufacturing method and groove processing apparatus for long steel plate - Google Patents

Description

  The present invention relates to a manufacturing method for manufacturing a long steel plate by butt welding long side portions of a rolled steel plate, and a groove processing apparatus for forming a groove portion in the long side portion of the rolled steel plate in this manufacturing method.

  Steel cells (large cylindrical structures) that are buried in harbors and artificial revetments on the artificial island and serve as the foundation for gantry cranes, for example, have an outer diameter of 20 to 30 m and a height of 20 to 40 m. Has been. The steel cell body plate (long steel plate) has, for example, a plurality of rolled steel plates each having a thickness of 8 to 40 mm, a short side portion of 4 to 5 m, and a long side portion of 10 to 20 m arranged on a work table. The body plate is formed by butt-welding the short side and the body plate, and the body plate is bent into an arc shape and then assembled and welded.

  Conventionally, when butt welding a rolled steel plate, as shown in Patent Document 1, after cutting and shaping the shear cutting edges such as the long side and short side of each rolled steel plate at a factory, etc., respectively, Further, a groove portion is formed. And these rolled steel plates are fixed on the work table with a predetermined route interval, and welding of the groove portion is performed.

  Patent Document 2 shows a prior art related to a groove processing apparatus. A cylindrical grindstone is rotatably arranged at a front and rear position in a traveling direction on a cart guided by a guide rail to be freely traveled. An X-shaped groove is formed in

JP2008-168319 (FIG. 1) Japanese Utility Model Publication No. 6-75647 (Fig. 2)

  However, in the manufacturing process of the conventional long steel sheet, after shaping the joint edge of the rolled steel sheet at a factory, etc., the groove is formed at the joint edge, and these rolled steel sheets are transported to a wide work table and fixed. Then, butt welding of the surface is performed to join the rolled steel plate and the long steel plate. And after inverting a long-sized steel plate, the back welding of the welding part back surface is performed, and it completes. In this case, there are problems that many work steps are required and cost and time are required.

  The present invention solves the above-mentioned problems, and a manufacturing method of a long steel plate capable of efficiently manufacturing a long steel plate by joining rolled steel plates whose edges are shear-cut, and a groove processing apparatus used in this manufacturing method The purpose is to provide.

According to the first aspect of the present invention, a long steel plate having a thickness of 15 to 40 mm, a length of 20 m or more, and a width of 10 m or more is obtained by butt welding the long sides of a rectangular rolled steel plate cut and shaped by a shear cutting device. A process for producing a long steel sheet,
A plurality of rolled steel plates are arranged on the work table so as to have the same posture as at the time of cutting and shaping, and fixed with a root interval between the long sides of the rolled steel plates,
With a groove processing device that can run freely on a rolled steel sheet, it runs along the route interval and cuts and removes the surface corner portions of both long sides to form a groove portion,
In a state where the rolled steel plate is fixed on the work table, the groove portion is pre-welded in a predetermined direction by a welding machine to join a plurality of rolled steel plates to form a long steel plate,
After the long steel plate is reversed and arranged on a work table, the welding is performed along the back surface of the welded portion applied to the groove portion.

Invention of Claim 2 is a groove processing apparatus used for the manufacturing method of the long-sized steel plate of Claim 1,
A cart body that can run on rolled steel plates,
A groove cutting machine having a leading cutter and a trailing cutter that respectively cut and remove the surface corner portions of the long sides of the left and right rolled steel plates on the cart central axis set in the front-rear direction on the cart body;
On the center axis of the carriage, the front carriage guide having a guide roller provided at the front of the carriage body and engageable from above at the route interval, and the rear part of the carriage body provided at the groove portion from above A rear carriage guide having an engageable guide roller,
In the groove cutting machine, the preceding cutter is attached to a leading end of a preceding drive shaft that is supported perpendicularly to a groove surface formed on a long side portion of one of the left and right rolled steel plates, and the trailing cutter However, it is attached to the front-end | tip part of the following drive shaft supported perpendicularly to the groove surface formed in a long side part by the other rolled steel plate on either side.

The invention described in claim 3 is the configuration described in claim 2,
The leading cutter and the trailing cutter are each formed in a thin disk shape having a cutting tip on the outer peripheral surface, and a concave shape in which the outer peripheral edge projects to the tip side with respect to a plane perpendicular to the leading driving shaft and the trailing driving shaft. This warp is formed.

The invention according to claim 4 is the configuration according to claim 2 or 3,
The trolley guide has a oscillating arm whose base end is supported by the trolley body so as to be swingable in the vertical direction via a horizontal pin on the trolley central axis of the trolley body, and a trolley guide horizontally A guide roller rotatably supported via a pin, and biasing means for biasing the swing arm downward to engage with a root interval and a groove portion, respectively.
The guide roller has an outer peripheral surface formed in a mountain-shaped cross section that is inclined on both sides from the center in the width direction.

  According to the structure of Claim 1, the long side part which is the shear cutting edge of a rolled steel plate is positioned and arranged on a work table at a root interval without shaping, and left and right rolling is performed by a groove processing device. Cut and delete the surface corner of the long side with a steel plate to form the groove, and with the welding machine still welding the long side of the rolled steel plate with the groove formed on the workbench A long steel plate is joined, and further reversed, and the back side of the welded portion is welded downstream to produce a long steel plate. Therefore, it is possible to continuously perform groove processing and preceding welding by positioning and fixing the rolled steel sheet once at a root interval without shaping the long side of the shear cutting edge. It is possible to reduce the number of steps and efficiently produce a long steel plate.

  According to the structure of Claim 2, the surface of the long side part which faced by providing a leading cutter and a trailing cutter on the cart main body which can run on a rolled steel plate, and making it drive | work along a route space | interval. Each corner portion can be cut and removed to form the groove portion in one run, and the rolled steel plate can be joined efficiently.

  According to the configuration of the third aspect, the leading cutter and the trailing cutter attached to the leading drive shaft and the trailing drive shaft, which are perpendicular to the groove surface, respectively, are external to the surfaces perpendicular to both the driving shafts. A concave warpage that protrudes toward the front end of the drive shaft is formed, so even if the bogie body floats up and the cutting depth of the leading and trailing cutters once becomes shallow, the bogie body returns to its original position. By doing so, it is possible to prevent convex warpage from occurring in the leading cutter and trailing cutter, and it is possible to cut deeply again with the cutting tip to return to the original cutting depth, and normal groove surface processing. Is possible.

  According to the configuration of the fourth aspect, by engaging the guide rollers having a chevron cross section provided on the front and back on the central axis of the truck with the root interval and the groove surface, respectively, the main body of the truck is routed to the central axis of the truck. The posture can be held so as to coincide with the interval, and the groove surface can be formed with high accuracy.

The Example of the manufacturing method of the long-sized steel plate which concerns on this invention is shown, and it is an expanded sectional view of the shear cutting edge of a rolled steel plate. (A), (b) is a graph which shows the result of having measured the displacement amount of the long side part of a rolled steel plate, respectively, (a) shows the rolled steel plate of the 1st example, (b) shows the rolled steel plate of the 2nd example. . (A)-(c) is a perspective view explaining the manufacturing procedure of a steel cell, (a) is a carrying-in operation | work of a rolled steel plate, (b) is a groove processing and welding operation, (c) is a trunk | drum. Indicates reversal work. (D)-(f) is a perspective view explaining the manufacturing procedure of steel cells, (d) is a bending process of a shell plate, (e) is an assembly operation of a shell plate, (f) is an assembly of a shell plate. Indicates welding work. It is a perspective view of the groove processing apparatus used for manufacture of a long-sized steel plate. It is a front view of a groove processing apparatus. It is a top view of a groove processing apparatus. It is a top view explaining arrangement | positioning of the preceding cutter of a groove processing apparatus, and a subsequent cutter. (A)-(d) is a schematic side view explaining the rotation direction of a preceding and following cutter, (a) shows the normal rotation state in an Example, (b) shows an inversion state, (c) Indicates a normal rotation and inversion state, and (d) indicates an inversion and normal rotation state. It is a schematic front view explaining the cutting | disconnection state of the groove part by a preceding cutter and a subsequent cutter. (A)-(c) shows a cart guide, (a) is a side view, (b) is a front view of a guide roller of a front cart guide, and (c) is a guide roller of a rear cart guide. FIG. (A)-(d) shows the attachment state of the leading and trailing cutters, (a) is an exploded perspective view, (b) is a sectional view in front view, (c) is a side view, and (d) is cutting. It is a partial expanded sectional view of front view of a state.

Embodiments of the present invention will be described below with reference to the drawings.
The steel cell SS (large cylindrical structure) SS shown in FIG. 4 (f), which is buried in the seawall of harbors and artificial islands and serves as the foundation for gantry cranes, has a diameter of 20-30m and a height of 20-40m. A plurality of body plates BP are joined and assembled, and the manufacturing method of a long steel plate according to the present invention is to manufacture the body plate BP.
(Rolled steel plate)
First, the rolled steel plate MP forming the body plate BP will be described with reference to FIGS. 1 and 2.

For example, when the thickness is 50 mm or more, the rolled steel plate MP manufactured by the rolling machine is shaped by cutting the mill edge with a gas cutter, but when the thickness is less than 50 mm, the rolled steel plate MP is shaped by cutting the mill edge with a shear cutter. . Since a rolled steel plate MP having a thickness of 15 mm to 40 mm is used for the body plate BP of the steel cell SS, the short side SE and the long side LE of the rolled steel plate MP are cut and shaped by a shear cutting machine. In the shear cutting machine, the length of the cutting blade is, for example, 1.0 to 1.5 m, and the long side portion LE is shaped by a plurality of times of cutting. The rolled steel plate MP used here has a short side SE of 4 to 5 m and a long side of 10 to 20 m, and 5 to 8 rolled steel plates MP are stacked in a stacked manner via the long side LE. Joining to form a body plate BP having a height (length) of 20 to 40 m and a width of 10 to 20 m, forming the body plate BP in an arc shape, and then assembling 4 to 8 body plates BP, the diameter is A steel cell SS having a height of 20 to 30 m and a height of 20 to 40 m is formed.

  As shown in FIG. 1, these shear cutting edges CE have shear sag 1 and dent s 2. Further, as shown in FIGS. 2A and 2B, when the line connecting the corner portions on both ends of the short side SE is used as the reference line SL of the long side LE, the long side LE has a slight width direction. A displacement amount δ is seen. For this reason, if the long side portions LE-R and L are merely brought into contact with each other, the gap (the route interval R described later) fluctuates greatly, so that the long side portions need to be shaped.

  Therefore, the present inventors detect and observe the displacement amount δ of the long side portions LE-R and L, and in the same production line (same lot) by the same rolling mill, the displacement amount due to the characteristics of the rolling mill. Attention was paid to the fact that δ is regularly distributed, and the displacement linearities of the left long side portion LE-L and the right long side portion LE-R are approximately approximate. And as a standard for arranging the rolled steel plates MP for joining, these rolled steel plates MP are arranged so as to have the same posture as when cut and shaped by a shear cutting machine, the respective surfaces are faced to the right, By matching the left long side portion LE-L of the rolled steel plate MP with the right long side portion LE-R of the left rolled steel plate MP, fluctuations in the gap can be sufficiently reduced, and groove processing is performed. And found suitable for welding work.

  By the way, in a certain position on the surface of the rolled steel plate MP, a tencil sheet TS on which standard dimensions such as a factory symbol, a lot number, a thickness, a width, and a length of the rolled steel plate MP are written is described. Are arranged in the same posture, the tencil sheets TS are arranged at the same position (lower left corner in the figure), and the rolled steel plate MP is arranged in the same posture as in the cutting and shaping, and the left long side portion of the rolled steel plate MP arranged on the right side. Variation in the gap between LE-L and the right long side portion LE-R of the rolled steel plate MP arranged on the left side can be reduced. Of course, when the gap is abnormally small, the long side portion LE is scraped off with a grinding machine, and when the gap is large, the long side portion LE may be overlaid by the welding machine SW and corrected. However, by arranging as described above, the number of corrections can be greatly reduced, and work efficiency can be improved. In addition, the rolled steel plate MP measured experimentally in FIGS. 2A and 2B has a thickness of 27 mm, a width of 1.5 m, and a length of 11.6 m.

(Manufacturing method of steel plate cell)
Next, the manufacturing method of steel plate cell SS is demonstrated with reference to FIG. 3, FIG.
1) As shown in FIG. 3A, a plurality of rolled steel plates MP are arranged on a work table (cell surface plate) 11 by a crane or the like. At this time, the tencil sheets TS written on the rolled steel plate MP are aligned and arranged at the same position. Then, between the long side portions LE-L, R of the adjacent rolled steel plates MP, the rolled steel plates MP are aligned and fixed with a root interval R for performing submerged arc welding, for example, 1 mm.

  2) The groove processing device 20 is arranged on the rolled steel plate MP and travels along the route interval R, and the long side is formed by the preceding cutter device 31R and the trailing cutter device 31R disposed before and after the groove processing device 20. The upper corner portions of the portions LE-R and L are cut and removed obliquely, and the Y-shaped groove portion (groove portion) 12 is formed by a single run. Of course, a V-shaped groove portion and an X-shaped groove portion can be formed instead of the Y-shaped groove portion.

  3) As shown in FIG. 3B, after the Y-shaped groove portion 12 of the rolled steel plate MP is tack welded by a welding machine, the Y-shaped groove portion 12 is moved in a predetermined direction by a submerged arc type welding machine SW. Are pre-welded, and the rolled steel plate MP is joined to form the body plate BP. While collecting the flux of the pre-welded part, gouging of the surplus part of the welding beat with a grinder or the like.

  4) As shown in FIG. 3 (c), the body plate BP is lifted by a crane, reversed, and placed on the work table 11 again. Then, subsequent welding is performed along the back surface of the preceding welding portion in the same direction as the welding direction of the preceding welding, thereby reducing welding distortion. Then, gouging is performed on the surplus portion of the welding beat.

  5) After cutting and shaping the side of the body plate BP, as shown in FIG. 4 (d), the body plate BP is lifted by a crane or the like and placed on the turntable 13, and formed into a curved shape by bending, Further, a reinforcing member is attached to the inner surface.

  6) As shown in FIGS. 4 (e) and 4 (f), a plurality of bent body plates BP are lifted and raised by a crane, arranged on the assembly 15 in an arc shape, and joined to other body plates BP. The steel plate cell SS is manufactured.

  In the manufacturing method of the steel plate cell SS, when the body plate BP is manufactured, the rolled steel plate MP is kept in the same posture and between the long side portions LE without cutting and shaping the long side portion LE for welding the rolled steel plate MP. By fixing in parallel with the root interval R, the displacement of the root interval R is reduced, and the long side portion LE, which is the shear cutting edge CE, is directly grooved, and Y is continuously changed without changing the posture. The mold groove 12 can be welded. As a result, it is possible to reduce the factory work process of cutting and shaping the shear cutting edge CE of the rolled steel plate MP and performing groove processing, as in the past, and the manufacturing time of the body plate BP can be greatly shortened. it can.

Also, by welding the front surface welding and the back surface welding in the same direction, it is possible to reduce the internal stress in the welded portion and obtain a good joined state.
(Bevel processing equipment)
Next, the groove processing apparatus 20 used in the production of the body plate will be described with reference to FIGS.

  The groove processing device 20 arranges a plurality of rolled steel plates MP to be butt welded on the work table 11 with a root interval R and is fixed by a jig or the like. The surface corners of the long side portions LE-R and L are moved along the route interval R by the leading cutter device 31F and the trailing cutter device 31R constituting the groove cutting machine 23 mounted on the carriage main body 21. Each of them is cut and separated obliquely to form the Y-shaped groove portion 12.

  As shown in FIG. 5 to FIG. 7, the groove processing device 20 is manually driven. Two sets of front and rear pairs are formed on both sides of a cart main body 21 and a cart central axis CL passing through the center of the cart main body 21 in the width direction. A grooved cutting machine 23 for forming a Y-shaped groove portion 12 by a circular caster (wheel) 22 provided with a circular shape, a leading cutter 36F and a trailing cutter 36R having a circular shape on a cart central axis CL, and a cart body 21 Front and rear carriage guides 24F and 24R that are positioned and guided along the route interval R, and a portal operation frame 25F that is erected on the front and rear of the carriage main body 21 to manually operate the steering direction and cutting speed. 25R and a control box 26. The straight casters (wheels) 22 are fixed so as to travel in the front-rear direction.

(Bevel cutting machine)
The groove cutting machine 23 includes a leading cutter device 31F disposed at the front portion and a trailing cutter device 31R disposed at the rear portion, and the leading cutter device 31F disposed at the front portion is located on the left side from the cart central axis CL. The trailing cutter device 31R disposed in the rear part is installed on the right side of the cart central axis CL, and is configured in a bilaterally symmetric structure.

  The leading cutter device 31F is perpendicular to the groove surface 14L of the Y-shaped groove portion 12 formed on the left long side portion LE-L of the rolled steel plate MP disposed on the front side and on the right side of the carriage body 21. A leading drive shaft 32F is rotatably supported by the inclined bearing base 33F via a bearing, and is provided at a tip end (lower end) protruding downward through an opening 21F formed in the carriage main body 21. A leading cutter 35F is attached. Further, the output shaft of a preceding drive motor (rotary drive device) 35F disposed on the inclined gantry 34F is connected to the base end portion of the preceding drive shaft 32F via a coupling.

  The trailing cutter device 31R is perpendicular to the groove surface 14R of the Y-shaped groove portion 12 formed on the right long side portion LE-R of the rolled steel plate MP disposed on the left side and on the left side of the carriage body 21. The trailing drive shaft 32R is rotatably supported by the inclined bearing base 33R via a bearing, and is provided at a tip end (lower end) protruding downward through an opening 21R formed in the carriage main body 21. A trailing cutter 35R is attached. In addition, an output shaft of a trailing drive motor (rotary driving device) 35R disposed on the inclined gantry 34R is connected to a proximal end portion of the trailing drive shaft 32R via a coupling.

27F is a safety cover that covers the drive unit of the preceding cutter device 31F, and 27R is a safety cover that covers the drive unit of the trailing cutter device 31R.
Here, as shown in FIG. 10, the Y-shaped groove portion 12 of the embodiment is set to a groove angle α = 70 °, but can be selected from α = 50 ° to 80 °. The inclination angle β of the leading drive shaft 32F and the trailing drive shaft 32R perpendicular to the front surfaces 14R and 14L is 1 / 2α = 25 ° to 40 ° (35 ° in FIG. 10).

  As shown in FIG. 12 (a), the leading and trailing cutters 36F and 36R are formed in a thin disk shape with a large number of cutting tips 36c attached to the outer periphery, and the leading and trailing drive shafts 32F, The outer peripheral receiving ring 38, the leading cutter 36F (the trailing cutter 36R), the pressing ring 37, and the fixing nut 39 are attached to the distal end screw portion 32a of the 32R in order from the base end side. The outer diameter R1 of the outer periphery receiving ring 38 is formed smaller than the outer diameter D1 of the preceding cutter 36F (following cutter 36R) by the cutting allowance e. A circular recess 38b having an inner diameter R2 and a predetermined depth is formed on the outer periphery of the center hole 38a on the side surface on the distal end side of the outer periphery receiving ring 38. The inner diameter R2 of the circular recess 38b is formed so that the outer diameter R3 of the presser ring 37 is larger. By tightening the fixing nut 39, the presser ring 37 is pushed into the circular recess 38b, and the leading cutter 36F (following) A warping amount d in which a concave warp in which the center portion of the cutter 36R) is recessed is formed and the outer peripheral edge protrudes toward the tip end side of the preceding drive shaft 32F with respect to the surface RF perpendicular to the preceding drive shaft 32F is 0.5 to 1. About 5 mm.

(Curvature of leading and trailing cutters)
The concave warpage formed in the leading and trailing cutters 36F and 36R will be described. The corners on the surface of the long side portions LE-R, L are obliquely cut by the thin disc-shaped leading and trailing cutters 36F, 36R having the cutting tip 36c on the outer peripheral surface, and the groove surfaces 14R, 14L are chamfered. In the case of forming, the cutting tip 36c of the leading and trailing cutters 36F and 36R is cut obliquely from the surface of the rolled steel plate MP and further fed out from the end surface of the long side portion LE. In such a cutting state, for example, when the straight caster 22 rides on dust attached to the surface of the rolled steel plate MP during the cutting and the carriage main body 21 is lifted, the leading and trailing cutters 36F and 36R are also lifted at the same time, and the groove surface. The cutting depths of 14R and 14L are once reduced. In this case, even if the carriage main body 21 returns to the original position, the uncut portions of the groove surfaces 14R and 14L are the leading and outer peripheries of the trailing cutters 36F and 36R, as indicated by phantom lines in FIG. A convex warp is generated by pushing the side surface, and the outer peripheral edge is pushed toward the base end side with respect to the surface RF perpendicular to the preceding drive shaft 32F. Then, cutting is continued with the convex warpage, and the cutting tip 36c is not cut into the rolled steel plate MP, and the cut depths of the groove surfaces 14R and 14L become shallow and cannot be formed to normal dimensions. In order to cope with this, the leading and trailing cutters 36F and 36R are previously provided with a concave warp opposite to the convex warp, so that the leading body 21 is also returned when the carriage main body 21 is lifted up. Then, it is possible to prevent convex warpage from occurring in the trailing cutters 36F and 36R, and to properly cut the cutting tip 36c into the rolled steel plate MP and return it to the original cutting depth, thereby forming the groove surface. 14R and 14L can be formed with high accuracy.

  Here, for example, an outer diameter D1 = 160 mm is used as the leading and trailing cutters 36F and 36R, but those having an outer diameter D1 = 100 mm to 250 mm can be used depending on the size of the groove processing apparatus 20. Further, the separation distance L in the front-rear direction needs to be a distance at least so that the leading cutter 36F and the trailing cutter 36R do not interfere with each other, and is selected from a range of 20 mm to 200 mm. This is because if the length is less than 20 mm, troubles such as the facet of the leading cutter 36F biting into the trailing cutter 36R may occur, and maintenance such as replacement work may be difficult. Further, if the separation distance L exceeds 200 mm, it is difficult to align the leading cutter 36F and the trailing cutter 36R with the route interval R, and it is difficult to accurately control the position of the carriage main body 21.

  Further, the rotational speed of the leading and trailing cutters 36F and 36R is 1500 to 3000 r. p. m (cutting speed is about 12.56 to 25.12 m / sec), and this is a rotational speed of 1500 r. p. If it is less than m, the cutting speed is reduced, the efficiency is poor, and the rotational speed is 3000 r. p. If it exceeds m, the durability of the leading cutter 36F and the trailing cutter 36R will be reduced, and the wear will become severe, and frictional heat will be generated and it will be necessary to cool it.

(Rotation direction of the leading and trailing cutters)
As shown in FIG. 9A, the cutting direction of the leading cutter 36F and the trailing cutter 36R is such that the traveling direction of the carriage main body 21 and the arcuate cutting direction by the cutting tip 36c are opposed to each other. 36c cuts while pressing the rolled steel plate MP, and the cutting is easy to be stabilized. Thereby, the cutting force by the leading and trailing cutters 36F and 36R works in the direction in which the rolled steel plate MP is pressed against the workbench 11 and is stabilized, and the running stability and posture stability of the carriage main body 21 can be increased. .

  As shown in FIG. 9B, when the cutting direction of the cutting tip 36c with respect to the rolled steel plate MP by the leading cutter 36F and the trailing cutter 36R is the same as the traveling direction of the carriage body 21, the leading and trailing cutters are used. The cutting force by 36F and 36R works in the direction of lifting the rolled steel plate MP from the work table 11, the cutting becomes unstable, and the running stability of the cart body 21 is lowered.

  Further, as shown in FIG. 9C, the cutting direction of the preceding cutter 36F with respect to the rolled steel plate MP by the cutting tip 36c and the traveling direction of the carriage main body 21 are relative directions, and the cutting tip 36c of the subsequent cutter 36R is cut. When the direction and the traveling direction of the carriage main body 21 are the same direction, the excavation force by the preceding cutter 36F works in the direction of pressing the rolled steel plate MP against the work table 11, and the excavation force by the subsequent cutter 36R works on the rolled steel plate MP. Since it works in the direction of lifting from the base 11, the cutting becomes unstable, and the running stability of the main body 21 is lowered.

  Further, as shown in FIG. 9 (d), the moving direction of the leading cutter 36F after the cutting with respect to the rolled steel plate MP by the cutting tip 36c and the traveling direction of the carriage body 21 are relative directions, and the cutting of the trailing cutter 36R is performed. When the moving direction after cutting with respect to the rolled steel plate MP by the tip 36c and the traveling direction of the carriage main body 21 are the same direction, the excavating force by the preceding cutter 36F acts in the direction of lifting the rolled steel plate MP from the work table 11, and the subsequent cutting Since the excavating force by the trailing cutter 36R at the position acts in the direction of pressing the rolled steel plate MP against the work table 11, the cutting becomes unstable as a whole, and the running stability of the carriage main body 21 is lowered.

(Trolley guide)
The front and rear cart guides 24F and 24R are attached to the front and rear positions on the cart central axis CL of the cart main body 21, and are formed in a front-rear symmetrical structure. That is, the swing arm 43 is supported by a bracket 41 attached to the front portion (rear portion) of the carriage main body 21 via a horizontal pin 42 so as to be swingable up and down, and a horizontal pin is mounted on the free end portion of the swing arm 43. A guide roller 45 that can be engaged with the root interval R and the Y-shaped groove portion 12 is rotatably supported via 44. As an urging means for urging the guide roller 45 downward to engage with the route interval R and the Y-shaped groove portion 12, an urging force due to the weight of the guide roller 45 and the swing arm 43 is employed. In addition to these own weights, the swing arm 43 may be urged downward by a separate weight or spring, and the urging force may be adjusted. The outer peripheral surface of the guide roller 45 is formed in a mountain-shaped cross section that is inclined at the same sharp angle γ = 70 ° as the groove angle α on both sides from the center in the width direction. Therefore, by engaging the guide roller 45 of the front carriage guide 24F with the route interval R and engaging the guide roller 45 of the rear carriage guide 24R with the Y-shaped groove portion 12, The carriage center axis CL and the route interval R (the Y-shaped groove portion 12) are matched to position the leading cutter 36F and the trailing cutter 36R with high accuracy, and the Y-shaped groove portion 12 can be formed with high accuracy. it can.

(Effect of Example)
According to the groove processing apparatus 20, the carriage main body 21 that can run on the rolled steel plate MP via the plurality of straight casters 22 is provided with the leading cutter 36F and the trailing cutter 36R on the carriage center axis CL. By causing the main body 21 to travel along the route interval R, the surface corner portions of the long side portions LE-R and L facing each other with the route interval R are cut and removed obliquely, and the long side portion can be removed by temporary travel. The Y-shaped groove portion 12 can be formed along LE-R and L, and the rolled steel plate MP can be efficiently joined to form the body plate BP.

  Further, the leading edge 36F and the trailing cutter 36R attached to the leading ends of the leading and trailing drive shafts 32F and 32R have the outer peripheral edge leading to the surface RF perpendicular to the leading and trailing driving shafts 32F and 32R. Since the concave warpage projecting to the side is formed, the groove surface 14R is restored when the carriage body 21 returns after the carriage body 21 is lifted and the cutting depth of the leading cutter 36F and / or the trailing cutter 36R becomes shallow. , 14L can prevent the leading cutter 36F and / or the trailing cutter 36R from being convexly warped, and the cutting tip 36c can be deeply cut to restore the cutting depth. The normal groove surfaces 14R and 14L can be formed.

  Further, front and rear cart guides 24F and 24R having guide rollers 45 having chevron-shaped cross sections that engage with the root interval R and the Y-shaped groove portion 12 on the cart central axis CL before and after the cart body 21, respectively. Therefore, the position of the carriage main body 21 can be maintained by aligning the carriage center axis CL with the route interval R and the Y-shaped groove portion 12, and the groove surfaces 14R and 14L can be cut with high accuracy.

BP trunk (long steel plate)
MP Rolled steel plate SE Short side portion LE Long side portion CE Shear cutting edge SL Reference line TS Tensile sheet R Route interval CL Bogie central axis δ Displacement amount α Groove angle 11 Work table 12 Y-shaped groove portions 14R, 14L Groove surface 20 Groove processing device 21 Bogie body 22 Straight running caster (wheel)
23 Groove cutting machine 24F, 24R Carriage guide tool 25F, 25R Operation frame 31F Leading cutter device 31R Trailing cutter device 32F Leading drive shaft 32R Trailing drive shaft 35F Leading drive motor 35R Trailing drive motor 36F Leading cutter 36R Trailing cutter 36c Cutting tip 37 Holding ring 38 Outer periphery receiving ring 43 Oscillating arm 45 Guide roller

Claims (4)

In the manufacturing method of a long steel plate, a long steel plate having a thickness of 15 to 40 mm, a length of 20 m or more, and a width of 10 m or more is formed by butt welding the long sides of a rectangular rolled steel plate cut and shaped by a shear cutting device. There,
A plurality of rolled steel plates are arranged on the work table so as to have the same posture as at the time of cutting and shaping, and fixed with a root interval between the long sides of the rolled steel plates,
With a groove processing device that can run freely on a rolled steel sheet, it runs along the route interval and cuts and removes the surface corner portions of both long sides to form a groove portion,
In a state where the rolled steel plate is fixed on the work table, the groove portion is pre-welded in a predetermined direction by a welding machine to join a plurality of rolled steel plates to form a long steel plate,
A method for producing a long steel plate, comprising reversely welding the long steel plate and placing the steel plate on a work table, followed by back welding along a back surface of a welded portion applied to the groove portion. It is a groove processing apparatus used for the manufacturing method of the long steel plate according to claim 1,
A cart body that can run on rolled steel plates,
A groove cutting machine having a leading cutter and a trailing cutter that respectively cut and remove the surface corner portions of the long sides of the left and right rolled steel plates on the cart central axis set in the front-rear direction on the cart body;
On the center axis of the carriage, the front carriage guide having a guide roller provided at the front of the carriage body and engageable from above at the route interval, and the rear part of the carriage body provided at the groove portion from above A rear carriage guide having an engageable guide roller,
In the groove cutting machine, the preceding cutter is attached to a leading end of a preceding drive shaft that is supported perpendicularly to a groove surface formed on a long side portion of one of the left and right rolled steel plates, and the trailing cutter Is attached to the tip of the trailing drive shaft that is supported perpendicularly to the groove surface formed on the long side by the other rolled steel plate on the left and right sides. The leading cutter and the trailing cutter are each formed in a thin disk shape having a cutting tip on the outer peripheral surface, and a concave shape in which the outer peripheral edge projects to the tip side with respect to a plane perpendicular to the leading driving shaft and the trailing driving shaft. The groove processing apparatus according to claim 2, wherein the warp is formed. The front and rear trolley guides have a oscillating arm whose base end is supported by the trolley main body through a horizontal pin so as to be swingable in the vertical direction on the trolley central axis of the trolley body, A guide roller rotatably supported at the front end portion via a horizontal pin, and biasing means for biasing the swing arm downward to engage the root interval and the groove portion, respectively.
The groove processing apparatus according to claim 2, wherein the guide roller has an outer peripheral surface formed in a mountain-shaped cross section that is inclined on both sides from the center in the width direction.

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